Checking The Valve Seats - Yamaha BT1100 2002 Service Manual

VALVE AND VALVE SPRINGS
5. Measure:
• valve margin thickness a
Out of specification
Valve margin thickness limit
0.8 mm
6. Measure:
• valve stem runout
Out of specification
NOTE:
• When installing a new valve, always replace the
valve guide.
• If the valve is removed or replaced, always
replace the valve stem seal.
Valve stem runout
0.03 mm
EAS00240

CHECKING THE VALVE SEATS

The following procedure applies to all of the valves
and valve seats.
1. Eliminate:
• carbon deposits
(from the valve face and valve seat)
2. Check:
• valve seat
Pitting/wear
3. Measure:
• valve seat width a
Out of specification
head.
Valve seat width limit
Intake: 1.8 mm
Exhaust: 1.8 mm
a. Apply Mechanic's blueing dye (Dykem) b
onto the valve face.
b. Install the valve into the cylinder head.
c. Press the valve through the valve guide and
onto the valve seat to make a clear pattern.
d. Measure the valve seat width. Where the
valve seat and valve face contacted one
another, the blueing will have been removed.
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ENG
Replace the valve.
Replace the valve.
Replace the cylinder head.
Replace the cylinder